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  <xsd:element abstract="true" id="nx_ShareBasedCompensationAwardPerformanceCriteriaAxis" name="ShareBasedCompensationAwardPerformanceCriteriaAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nx_ShareBasedCompensationAwardPerformanceCriteriaDomain" name="ShareBasedCompensationAwardPerformanceCriteriaDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nx_ShareBasedCompensationAwardTrancheFourMember" name="ShareBasedCompensationAwardTrancheFourMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nx_StockIssuedDuringPeriodTreasurySharesPerformanceSharesVested" name="StockIssuedDuringPeriodTreasurySharesPerformanceSharesVested" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="nx_TaxCutsandJobsActof2017ChangeinTaxRateIncomeTaxExpenseBenefit" name="TaxCutsandJobsActof2017ChangeinTaxRateIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nx_TaxCutsandJobsActof2017ExcessTaxBenefits" name="TaxCutsandJobsActof2017ExcessTaxBenefits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nx_TaxCutsandJobsActof2017GILTIandFDII" name="TaxCutsandJobsActof2017GILTIandFDII" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="nx_TaxCutsandJobsActof2017TransitionTaxforAccumulatedForeignEarningsIncomeTaxExpenseBenefit" name="TaxCutsandJobsActof2017TransitionTaxforAccumulatedForeignEarningsIncomeTaxExpenseBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="nx_TaxCutsandJobsActof2017TrueUpOfAccruedTaxes" name="TaxCutsandJobsActof2017TrueUpOfAccruedTaxes" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nx_TermLoanFacilityMember" name="TermLoanFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="nx_TradenamesAndTrademarksMember" name="TradenamesAndTrademarksMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="nx_WarehouseLeaseinAccumulatedDepreciation" name="WarehouseLeaseinAccumulatedDepreciation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="nx_WarehouseLeaseinPropertyPlantandEquipment" name="WarehouseLeaseinPropertyPlantandEquipment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
</xsd:schema>
